Traverse-motion for yarn-spinning apparatus.



L. S. BURBANK.

TRAVERSE MOTION FOR YARN SPINNING APPARATUS.

APPLICATION FILED MAY 31, 1913, 1,125,924. Patented Jan. 26, 1915.

4 SHEETS-SHEET l.

Witnesses. I Inventor.

W .fi MWMA, Louis SBurbcmK,

AM. Mam MW AM L. S. BURBANK. TRAVERSE MOTION FOR YARN SPINNINGAPPARATUS.

- APPLICATION FILED MAY 31, 1913,

1,125,924.. Patented Jan. 26, 1915.

4 SHEETS-SHEET 2.

Inventor.

tnesses LouisS.BurbanK,

NORRIS PETERS co.. FHOTO-LITHO.. WASHINGTON. D. C.

Patented Jan. 26, 1915.

4 SHEETS-SHEET 3.

Inventor. Louis SBurbank,

CO. PHOTO'LITHQ. WASHINGTON. D. c.

L. S. BURBANK.

TRAVERSE MOTION FOR YARN SPINNING APPARATUS.

APPLICATION FILED MAY 31,1913.

MN" :3 um

52.3mm irMiML [v H E NORRIS PETERS L. S. BURBANK.

TRAVERSE MOTION FOR YARN SPINNING APPARATUS.

APPLICATION FILED MAY 31, 1913,

1,125,924. Patented Jan.26,1915.

4 SHEETS-SHEET 4. Flg. 8.

FiglO.

Witnesses. Inventor.

Wfim lgouis 5. Burbank M0 9 mm fg UNITED s rn rns Paranaores.

LOUIS S. BURBANK, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR TO DRAPERCOMPANY, OF HOPEDALE, MASSACHUSETTS, A CORPORATION OF MAINE.

TRAVERSE-MOTION FOR YARN-SPINNING APPARATUS.

Specification of Letters Patent.

Patented Jan. 26, 19115.

Application filed May 31, 1913. Serial No. 770,865.

To all 1071.0121- it may concern Be it known that I, LOUIS S. BURBANK, acitizen of the United States, residing at l-lopedale, county oflVorcester, State of Massachusetts, have invented an Improve ment inTraverse-Motions for Yarn-Spinning Apparatus, of which the followingclescription, in connection with the accompanying drawing, is aspecification, like characters on the drawing representing like parts.

This invention relates to a traverse mo tion for yarn spinning apparatusof that type wherein a primary winding or bunch is first wound or spunupon the bobbin or yarn carrier and thereafter a secondary or mainwinding of the yarn is laid upon the yarn carrier to complete thebuilding of the yarn mass thereon.

Yarn carriers on which the yarn is wound in this way to provide aprimary winding or bunch are designed for use in automaticweft-replenishing looms wherein the change of filling when theyarn hasbeen woven off to a predetermined extent is effected through theinstrumentality of a fceler.

The primary winding or bunch contains a sufficient quantity of yarn tomaintain continuity of filling when the filling-replenishing operationis effected.

The objects of the present invention are to provide a novel mechanismfor building the bunch on a yarn carrier which can be easily applied toany spinning frame without requiring special parts, and further toprovide a bunch builder of this type which is adapted to wind the bunchon the yarn carrier in such a form that the yarn will draw off therefromfreely during weaving and without danger of, breaking; and further toprovide a bunch-building mechanism of this type constructed so that thelength and the shape of the bunch as well as the number of traverses putinto the bunch and the position of the bunch on the bobbin or yarncarrier can be adjusted to suit the requirements of use. .By means of mymechanism it is possible, therefore, to wind a bunch of the size, shape,character and position required for any particular feeler loom. f

:In order to' provide a bunch-building mechanism which can be used inconnection wlth any spinning frame, I have devised a bunch-buildingmechanism which is associated wlth and operated by the builder chainofthe usual builder mechanism, so that a spinning frame can be equippedwith my bunch-building mechanism merely by at taching the latter to theframe of the machine and then passing the builder chain of the usualbuilder mechanism through my apparatus.

My improved bunch building mechanism is so constructed that during theoperation of winding the bunch it operates to absorb part of the motiongiven to the builder chain by the builder arm so that only a portion ofthis motion will be transmitted to the ring rail. This causes the ringrail to have a short traverse which results in winding the bunch on theyarn carrier. This absorption of part of the motion given to the builderchain is provided for by forming a loop in the builder chain andemploying mechanism for lengthening and shortening the loop as the chainreciprocates, the lengthening of the loop absorbing part of the motiongiven to the builder chain.

My improved bunch builder mechanism is also provided with means wherebyafter the bunch is formed it becomes automatically inoperative therebypermitting all of the motion given to the builder chain to betransmitted to the ring rail, this being the condition that existsduring the laying of the winding. My bunch builder mechanism is providedwith adjustments which provide for varying the size, shape and positionof the bunch on the yarn carrier.

My invention also comprehends means whereby the traverse of the ringrail is shortened just before the bobbin is completely wound, so that amass of yarn which is laid with the short traverse will be wound on thetip of the bobbin. The advantage of this is that a larger amount of yarncan be wound on the bobbin and the final winding on the tip of thebobbin acts as a means to hold the yarn mass solidly in place.

Referring to the drawings wherein T have illustrated a selectedembodiment of my invention which is sufiicient to show the principlethereof, Figure 1 is a front elevation of a portion of a spinning framewith my improvements applied thereto; Fig. 2 is an enlarged front viewof my improved bunch builder mechanism; Fig. 3 is a similar view lookingfrom the opposite side; Fig. 4: is a top plan view; Fig. 5 is asectional view; Fig. 6 is a sectional view on substantially the linew.r, Fig. 3; Fig. 7 is a side elevation of the builder motion; Fig. 8 isa diagrammatic view showing the principle of operation of mybunch-building mechanism; Fig. 9 is a view similar to Fig. 2, butshowing the parts in a different position; Fig. 10 shows a bobbin oryarn carrier which has been wound by means of the hereindescribedinvention; Fig. 11 is a section on substantially the line g ;z Fig. 6.

1 designates the girder or ladder of the main frame, the portion 2 ofwhich constitutes the spindle rail in which are mounted the usualspindles 3 adapted to receive bobbins or yarn carriers 4, and 5 is theusual ring rail provided with the spinning rings 6. This ring rail issupported by the lifter rods 7 which are connected to the rocking arms 8pivoted at 9 and having integral therewith the upturned arms 10 carryingthe segment 11 to which the builder chain 12 is secured. This builderchain leads to the winding drum 13 rotatably mounted upon the builderarm 14 which is pivoted at 15 and which carries the worm 16 that engageswith the worm teeth formed on the gear 17 that is rigid with the windingdrum 13. The shaft 18 of the worm 16 has the ratchet or pick wheel 19thereon which is actuated by the pick pawl 20 in usual fashion. 21designates the traverse cam which operates to reciprocate the builderarm 14. The parts thus far described are or may be all as usual inbuilder or traverse motions of yarn spinning machines, and form no partof my present invention.

The cam 21, it will be understood, is so constructed that it gives avibrating movement of constant stroke to the builder arm 14 which, iftransmitted to the ring rail, would cause a traverse of uniform lengthof the yarn on the bobbin. As the winding proceeds the pick pawloperates to gradually turn the winding drum 13, as will be readilyunderstood by those who are familiar with the art, thereby causing agradual lengthening of the builder chain 12 and a consequent gradualrise in the ring rail This is commonly referred to as the gain which isgiven to the traverse motion as the winding proceeds. As stated above,my invention aims to provide a bunch-building mechanism which can beapplied to a spinning frame of the type above described withoutrequiring any specially constructed parts in the builder motion, and myinvention, therefore, makes it possible to apply a bunch-buildingmechanism to any spinning frame without the necessity of rebuildingentirely or in part the traverse motion of said machine.

The principle on which my invention operates can perhaps best be seenfrom Fig. 8, in which 12 designates the builder chain which has a loop22 formed therein, said loop passing around a sprocket wheel 23rotatable about the center 39. Associated with the sprocket wheel 23 isa bunch building cam 25 adapted to engage a roll 26 that is mounted infixed bearings.

Assuming that the bunch-building cam 25 is secured to the sprocket wheel23 to rotate therewith. it will be readily seen that as the builderchain moves back and forth during the vibrating movement of the builderarm 14., such back and forth movement will cause the sprocket wheel 13to oscillate. This oscillating movement causes the bunch-building cam 25to ride over the stationary roll 26. The face 56 of this bunch-buildingcam is eccentric relative to the sprocket wheel 23 so that as thesprocket wheel turns in the direction of the arrow a Fig. 8, theengagement of the cam face 56 with the roll 26 will force thebunch-building cam 25 and sprocket wheel 23 bodily downward therebylengthening the loop 22, while the sprocket wheel is rotated in theopposite direction by the movement of the builder chain, said sprocketwheel will rise thereby shortening the loop 22. So long as the buildercam 25 is in operative engagement with the roll 26, therefore, the backand forth or reciprocating motion of the builder chain 12 will cause alengthening and shortening of the loop 22, the extent of suchlengthening and shortening movement depending upon the contour of thebunch-building cam 25. This cam 25 is so disposed that the loop 22 ofthe builder chain is lengthened when the builder arm 12 is rising andthe builder chain is moving in the direction of the arrow Z), while theloop is shortened during the movement of the chain in the oppositedirection. It will thus be seen that at each movement of the builderchain 12 in a direction to raise the ring rail the loop 22 islengthened, while at each movement of the chain in a direction to lowerthe ring rail the loop is shortened. The extent to which the ring rail 5is raised and consequently the extent of the traverse at any particulartime in the operation of the spinning machine depends upon the amount ofmotion which is transmitted from the builder chain 12 to the rocker 8,and when the loop 22 in the builder chain is lengthened and shortened,as above described, a part of the motion which is transmitted to thebuilder chain from the builder arm will be absorbed in the builder chainso that only a portion of the motion of the builder arm will betransmitted to the ring rail. This absorption of part ofthe motion ofthe builder arm on the bobbin.

in the builder chain causes a corresponding shortening of the traverse.This is the operation which is carried out by my invention during thebuilding of the bunch 80 After the bunch has been wound on the bobbinthen the bunch-building cam 25 automatically becomes inoperative, aswill be more fully hereinafter described, and during the Winding of themain portion 99 of the yarn mass on the bobbin, the sprocket wheel 25 isheld from rising and falling movement with the result that theoscillation of said sprocket wheel will not cause any lengthening orshortening of .the loop and the entire motion which is given to thebuilder chain is thus transmitted to the ring rail.

It will thus be seen from the above that my invention provides means forabsorbing part of the motion given to the builder chain during theoperation of Winding the bunch 80 while permitting the full motion ofthe builder chain to be transmitted to the ring rail during the windingof the main portion 99 of the yarn mass. The preferred mechanism bywhich this operation of absorbing part of the motion of the builderchain is secured will now be described.

The frame 1 is shown as having secured thereto a supporting bracket 28on which the bunch-building mechanism is mounted. This bunch-buildingmechanism is in turn sustained by a frame 29 which has an annular shapeand which is formed with two slots 30 in which are adjustably securedsupporting arms 31. These arms 31 are in turn sustained by hubs 32 in aplate 33 which is adjustably secured to the supporting bracket 28 bymeans of clamping bolts 34, said bracket preferably having slots 35therein to provide of vertical adjustment. The frame 29 sustains twodirection pulleys 36 over which the bunch-building chain 12 passes, andit also supports a swinging carrier 3'? which is pivoted to the frame at38 and which carries the sprocket wheel 23 over which the chain passesand the bunch-building cam This swinging carrier 37 sustains a shaft 39see Fig. 5. on which the sprocket wheel is mounted for rotation. Thissprocket wheel is made fast to a hub a0 which is loosely mounted on theshaft 39 and the hub has mounted thereon two disks 4.1 and 42 betweenwhich the bunch-building cam 25 is received. The hub %0 also has clampedthereon a collar 43 provided with an arm it which is connected to thedisks 41, through a pin 45 that extends transversely through both disks.The end of the arm fat is forked and is provided with two adjustingscrews l6 between which the end of the pin 45 is received, theseadjusting screws providing for making a slight angular adjustment of thedisks ll. 42 relative to the hub -10. The bunch-building cam 25,

which, it will be remembered, is received between the two disks 41 and42, is pivot-ally mounted upon a pin 17 see Fig. 6 carried by saiddisks, said pin preferably having a' bushing 48 thereon whichconstitutes a spacer for holding the disks ll, 4:9! apart sufficientlyto prevent them from binding on the bunch-building cam, and alsoconstituting a Wear bushing for the cam.

The bunch-building cam 25 is acted upon by a spring 19 which tendsnormally to throw it outwardly into its operative position, as shown inFigs. 2 and 3, but which permits the cam to collapse into itsinoperative position, as seen in Fig. 9. One end of this spring 49 isconnected to the tail 50 of the bunch-building cam 25, and the other endof the spring is connected to a thrust member 51 which is confinedbetween the two disks 41, l2, and the end 52 of which engages in a notchin the bunch-building cam above the pivotal pin a8. The outer end of thethrust member 51 has bearing against a guide member 53 and the effect ofthe spring 49 is thus transmitted to the bunch-building cam on bothsides of the pivot, said spring acting on the cam in both places with aforce tending to turn it in the same direction. As the bunch-buildingcam swings about its pivot 48, as will be presently described, thethrust member 51 will move up and down along the guide 53. This guide 53is in the nature of a metal strip which is of a width corresponding tothe distance between the disks a1 and 42, and it is sustained at its endon clamping bolts 51 that tie the disks together.

The roll 26 against which the bunch-building cam operates is journaledin a supporting member 55 which is secured to the frame 29.

The normal position of the bunch-building cam at the beginning of thewinding of the bunch is that shown in Figs. 2, 3 and S. The frame 29 isfixed in position so that the roll 26 turns about a fixed axis. It will,therefore, result that as the builder chain 12 moves in the direction ofthe arrow I) the sprocket wheel will be turned about its axis therebyturning the disks 11 and 42 and the bunch-building cam saidbunchbuilding cam turning in the direction of the arrow at, Figs. 2, 3and 8. This movement of the cam causes the face 56 thereof to pass overthe roll 26, and as the face is eccentric to the axis of the sprocketwheel, such movement forces the sprocket wheel downwardly. as seen bythe dotted lines Fig. 8 the frame 37 swinging down about the pivot 38during this movement. This causes the lengthening of the loop 22 in thebuilder chain which was above described and the consequent absorption ofa portion of the motion of the builder chain, so that only a. portion ofthe complete motion of the chain is transmitted to the ring rail. Whenthe chain moves in the opposite direction the sprocket wheel 23 andbunch-building cam are turned back into the position shown in Figs. 2and 3 thereby giving up the length of builder chain which was absorbedin the loom.

The builder chain has two distinct motions as usual in mechanisms ofthis type, one the back and forth, motion which produces the regulartraverse motion and the other a gradual outfeed which produces theso-called gain this gain or outfeed resulting from the operation ofunwinding the builder chain gradually from the winding drum 13. Thisgain or gradual out-feed of the builder chain will cause a gradualturning movement of the sprocket wheel and bunch-building cam, so thatthe roll 26 will gradually advance CV81 the cam face 56, and if thisoperation were continued long enough the sprocket wheel 23 and disks 11,12 would be turned to such an extent through the gradual outfeed of thebuilder chain that the bunchbuilding cam would pass completely out fromunder the roll 26. This gain is quite slow, however, and as it isnecessary to lay only a few traverses in the bunch, I have providedmeans whereby the movement of the bunclrbuilding cam past the roll 26 isaccelerated. To accomplish this end the cam is provided with gear teeth57 see Fig. 11, which mesh with a pinion 58 carried by a shaft 59 thatis journaled at one end in the disk 11, and at the other end in asupporting bracket 60. This shaft 59 has fast thereon a ratchet or pickwheel 61 which is adapted to be engaged by a pick pawl 62 that isslidably mounted in the housing 55. 6 1 is a stop pawl adapted to engagethe pick wheel to prevent backward rotation thereof, said pawl beingmounted for turning movement on the hub 65 of the disk 4.2 and beingacted upon by a suitable spring 66. Each time that the sprocket wheeland builder cam turn into the dotted line position shown in Fig. 8 thepick pawl engages the pick wheel and turns the latter thereby swingingthe bunch-building cam 25 inwardly, and by this operation said cam ismoved inwardly as the sprocket wheel is gradually turned. As a result ofthese two movements the point 63 of the cam is brought directly underthe roll at the end of the predetermined number of traverses necessaryto form the desired bunch on the bobbin. At this time it is desirablethat the bunch-building cam should be thrown out of further operation,and my invention provides means whereby said cam will be automaticallyrendered inoperative at the time when the point 63 thereof comes underthe roll 26. The manner of pivoting the cam in the disks is such thatwhen the disks 4:1, 42 are turned into such a position that the point 63of the cam comes directly under the 7 roll 26, then the pressure of thecam against the roll due to the strain on the builder chain 12 is in aradial direction and is such as to force the cam down into itsinoperative position shown in Fig. '9, such movement being against theaction of the spring 19. The stop pawl 61 operates to hold the cam insuch position. As the bunch-building cam is thus rendered inoperative,means come into play for locking the swinging support 37 and the shaft39 in a fixed position during the winding of the remainder of thebobbin, so that the loop 22 in the builder chain will remain of the samelength and the full movement given to the builder chain will betransmitted therethrough to the ring rail. This is the condition of theparts during the laying of the main or service winding 99 on the bobbin.The means for thus locking the swinging frame 37 and shaft 39 in theirfixed position is as follows: 67 designates a locking pawl which ispivotally mounted to the frame 29 at 68, said pawl having a weightedextension 69 which tends normally to swing the upper end thereof towardthe center of the frame. This pawl is provided with a shoulder 70 whichat the proper time is adapted to engage over the portion 71 of theswinging frame 37 thereby locking said frame in its lowered position andin a position in which the cam disks 41, 42 will be held out ofengagement with the roll 26. The locking pawl 67 has secured thereto aspring arm 72, the upper forked end 73 of which rests against either theportion 71 of the frame 37 or the periphery of the disk 41. As the disks11, 12 gradually turn in the direction of the arrow A, the notch or lowportion 71 in the periphery of the disks is finally brought opposite theportion 73 of the spring arm and when this occurs the latch 67 is swunginwardly by its weight 69 thereby bringing the shoulder 7 0 intoposition to engage the portion 71 of the swinging frame 37 During eachreciprocation of the builder chain 12 this swinging frame 37 will swingdownwardly to bring the point 71 below the level of the shoulder 70 andwhen during the operation of the device the notch 7a is brought aroundopposite the portion 73, then at the next downward movement of the frame37 which is that during which the cam 25 is collapsed, the latch 67 willengage the frame 37 and thus hold it in its lowered position, as seen inFig. 9. This is the position in which the parts remain while the main orservice winding 99 is being wound, and when the parts are in thisposition the periphery of the disks 4:1, 42 is slightly below the roll26. There is, therefore, no friction on the disks and the builder chainand disks have a free oscillating movement.

My invention also provides means Whereby when the bobbins have beencompletely Wound and are ready to be dofled, the latch manna 167 will bedisengaged fromthe swinging iframe 37,;thus allowing the bunch-building.mechanism to be again thrown into operative engagement with the roll26. When -;the bobbins are filled the ring rail 5 will be near the topof the bobbin but at the nected to the rocker arm 8 or by turning l. thewinding drum 13 to wind the builder :ohain 12 thereon.

My invention comprehends means whereby when the ring rail :is broughtinto lowered position by either one of these two means, the latch 67will be disengaged from the swinging frame.

It will be remembered that the latch is normally held in its inoperativeposition shown in Fig. 2 by the engagement of the portion 73 of thespringarm 72 against the periphery of the disk 41. WVhen the disks areturned into a position to bring the notch 74 therein opposite theportion 7 3, then the latch 67 is swung forwardly into its operativeposition to engage the portion 71 of the swinging frame 37, as abovedescribed. During the subsequent turning movement of the disks 41, 42,the inclined portion 7 6 thereof engages the nose portion 73 of thespring arm 72 and forces the latter backvwardly, thus flexing the armaway from the portion 67 as seen by the dotted lines Fig.

.9. During this time the shoulder 70 of the pawl is engaging the portion71 of the swinging frame 37, and the fr ctionalengagement between theseparts is sufficient to prevent the pawl from belng disengaged from theswinging frame when the spring jarm 72 is flexed backwardly. This is theposition which the parts will maintain during the winding of the main orservlce portion 99 of the bobbin.

When the bobbin is completely wound if the ring rail is lowered by theoperator depressing the treadle 75, then such downward movement of thetreadle Wlll g1ve slack to the builder chain 12, such slack allowing theswinging frame 37 to drop somewhat thereby relieving the pressurebetween the shoulder and the part 71 of said swinging frame. As soon asthis occurs the resiliency of the sprmg arm 72 wlll swingthe latch 67backwardly into the position shown in Fig. 2 so that when the parts arerestored to their normal position the building mechanism will bebrought. against the roll 26. If, on the other hand, the ring rail 5 isdepressed into its. lowered position by winding up the builder chaln onthe winding drum 13, then I provide a cam 77 which is adjustably-clampedbe tween the two disks ll, 42and which projectsfslightly beyond theperiphery of the disks," as seen; in Fig. 2. placed between the disksthat it will come This cam is so around under the roll 26 at the timewhen the bobbins are substantially wound. As soon as the cam comes intoengagement with the roll 26, then the swinging frame 37 will be forceddownwardly thereby relieving the frictional pressure between theshoulder 70 and the part 71 and allowing the resiliency of the springarm 72 to throw the latch 67 into its inoperative position. The cam 77can be placed in any position around the periphery of the disks ll, 42,depending upon the length of the bobbin desired. This cam 77 is alsomade use of for laying an auxiliary bunch or traverse of short length onthe tip end of the bobbin, as shown at 7 S in Fig. 10, for it will beobserved that when ,the disks 41, 42 have been turned into a position sothat the cam 71 begins to oscillate beneath and in engagement with theroll 26, then during such movement of the builder chain 12 the swing ingframe 37 will be lowered and the loop 22 in the builder chain will belengthened, thus absorbing some of the motion of the builder chain as isdone by the formation of the bunch-building cam 25. The traverse isthereby shortened to the extent which the loop is lengthened and a mass78 of yarn will be laid on the tip of the bobbin with a comparativelyshort traverse. This yarn mass 78, which I will refer to as the finalwinding, is laid over the tip end of the main or service winding, and itacts to hold the service winding firmly in place and also constitutes anadditional yarn mass which increases the total amount of yarn sustainedby the yarn carrier. This final winding 7 8 is applied to the bobbin insuch a position that it does not appreciably increase the total lengthof the yarn mass on the bobbin, but it fills in a space at the tip ofthe bobbin which would otherwise have no yarn thereon. I believe I amthe first to provide means for winding a bobbin with a primary and afinal winding both of which are laid with a shorter traverse than themain or service winding. I also believe I am the first to wind anybobbin whether or not it has a primary winding thereon, with a finalwinding which is wound with a short traverse thereby to provide whatconstitutes a bunch at the tip of the bobbin.

After the winding ofthe bobbin is completed and the parts are restoredto their normal position for beginning the winding of yarn on fresh orunfilled bobbins, then it is necessary that the bunch-building mechanismshould be again rendered operative. My invention provides means whereby.the bunch-building cam 25 which, it will be remembered has been held inits position shown in Figs. 2 and 3.

winding of the main portion of the bobbin,

the builder chain 12 has been wound up on the drum 13 and the mechanismis ready to begin winding on fresh bobbins, the disks 41, 42 will bebrought into substantially the hen the spinning frame is started upafter the filled bobbins have been dofi'ed and fresh bobbins have beensupplied, it is customary for the operator to jump the ring rail up anddown as the frame starts in order to prevent the ends from breaking,this being accomplished by depressing the treadle '75 slightly with thefoot several times. This action of jumping the ring rail is made use offor automatically restoring the bunch-building cam to its operativeposition.

It will be remembered that the bunch- "building cam 25 is prevented frommoving outwardly under the influence of the spring 49 by the lockingpawl 64, and the operation of restoring the bunch-building cam to itsoperative position consists in releasing the pawl 64 from the ratchetwheel 61, thus allowing the spring 49 to swing said cam outwardly intoits operative position. This is accomplished by providing the pawl 64with a tail 79 which is adapted to engage a stop finger 98 rigidlysecured to the frame 29 (see Fig. lVhen the spinning frame is started upand the operator jumps the ring rail, this jumping action gives a slightslack to the builder chain 12, thus allowing the swinging frame 37 toswing downwardly somewhat. This downward movement brings the tail 79 ofthe locking pawl against the stop 98 thereby disengaging the lockingpawl from the pick wheel 61. As soon as the pawl is thus disengaged thespring 49 operates to move the bunchbuilding cam 25 outwardly into itsoperative position shown in Figs. 2 and 3. The extent of such outwardmovement is limited by an adjustable stop 81 in the form of a stop screwcarried by the frame 29.

As stated above my mechanism is constructed so as to permit of avariation in the length, position and shape of the bunch. The length ofthe primary bunch 80 is determined by the shape of the cam face 56. Thesteeper. the cam faceor the more nearly radial said face extends theshorter will be i the bunch, while the more nearly said cam faceapproaches the curvature of the disks 41, 42, the longer. will be thebunch. This will be evidentwhen it is remembered that at eachreciprocation of the builder arm the builder chain 12 moves back andforth through a definite distance, and when it is observed that thesteeper or more nearly radial. the face 56 of the bunch-building cam isthe greater will be the downward and upward movement of the frame 37 ateach reciprocation of the builder chain. This up and down movement ofthe frame 37 results in shortening or lengthening the loop thereby toabsorb in the builder chain a portion of the motion given thereto. Themore of the motion of the builder chain which is given up in lengtheningthe loop the less will be the proportion of the motion transmitted tothe ring rail, and hence the shorter the traverse. Therefore, it will beseen, that by making the face 56 of the builder cam steep a shorttraverse will be given during the winding of the primary bunch 80, thusmaking a short bunch, while by giving the face 56 a less angle the bunch80 will be correspondingly lengthened.

in building a primary bunch 80 it is desirable that the rear end 83 ofthe bunch should have a gradual incline so that when the yarn which iswound at the rear of the hunch is being drawn off from the bobbin therewill be no danger of said yarn catching on the bunch. and thus becomingbroken. I secure this desirable shape to the bunch 80 by giving the camface 56 a special contour, said face being made so as to give a morerapid movement to the traverse of the ring rail when the rear portion 83of the bunch is being wound than when the front portion thereof is beingwound. This causes the bunch to be built with the inclined rear portionwhich will offer no obstruction to the .free drawing oif of the yarnfrom the bobbin.

It is of advantage to build the bunch a slight distance from the butt ofthe bobbin and then to wind the main winding so as to entirely cover thebunch and fill the portion of the bobbin between the bunch and the buttthereof, for this enables a larger quantity of yarn to be wound on thebobbin than would be possible where the bunch is situated entirelyoutside of the main or service winding.

The position of the bunch from the butt of the bobbin is determined bythe distance which the bunch-building cam is allowed to stand out beyondthe disks 41, 42, and this in turn is determined by the stop screw 81.If the bunch is to be built down close to the butt of the bobbin, thenthe cam 25 is allowed to have its extreme outward position, while if thebunch is to be built at a slight distance away from the butt of thebobbin, then the set-screw 81 will be adjusted inwardly so as to limitthe extent to or a left hand frame without the requiring of anyadditional parts for this purpose.

Another advantage which is inherent in my bunch builder is that it canbe applied to any spinning frame now in use without requiring anyalteration in the. ordinary bullder mechanism, for the bunch builder andwhich acts to absorb or take up in'the builder chain a portion of themovement given thereto by the builder arm so that only a portion of suchmovement will be transmitted to the ring rail, and I desire to claimthis feature broadly.

Having fully described my invention, what I claim as new and desire tosecure by Letters Patent is 1. In a builder motion, the combination witha ring rail, of builder mechanism for giving traverse to the ring railand including a builder chain, and means to actuate the latter,bunclrbuilding mechanism comprising a loop-forming element over whichthe chain passes and which forms a loop therein, and means for movingsaid elementbodily thereby to lengthen and shorten the loop of the chainto produce a short traverse in the ringrail for the formation of abunch.

2. In a builder motion, the combination with a ring rail, of buildermechanism for giving traverse to the ring rail and including a builderchain and means to actuate the latter, bunch-building mechanism comprising means forming a loop in the chain, means for causing alengthening and shortening of theloop thereby to produce a shorttraverse in the ring rail for the formation of the bunch, and means torender the bunch-building mechanism inoperative after the bunch has beenwound.

3. In a builder motion, the combination with a ring rail, of buildermechanism for giving traverse to the ring rail and including a builderchain and means to actuate the latter, bunch-building mechanismcomprising means forming a loop in the chain, means for causing alengthening and short ening of the loop thereby to produce a shorttraverse in the ring rail for the formation of the bunch, and automaticmeans to render rail, said mechanism including a builder chain and meansto actuate the latter, bunch-building mechanism comprising aloop-forming element over which the chain passes and which forms a looptherein, and

means actuated by the movement of the chain for giving said element abodily movement thereby to produce a short traverse in the ring rail forthe formation of the bunch.

5. In a device of the class described, the combination with a ring rail,of builder mechanism for giving traverse to the ring rail, saidmechanism including a builder chain and means to actuate it, andbunchbuilding mechanism comprising a loopforming element over which thechain passes and which forms a loop therein, and means for moving saidelement bodily in one direction to lengthen the loop as the ring-railmoves in one direction and for moving said element bodily in theopposite direction to shorten the loop when the ring-rail moves in theopposite direction.

6. In a device of the class described, the combination with a ring rail,of means for giving said ring rail a traversing movement, said meansincluding a builder chain and bunch-building mechanism comprising meansfor forming in the builder chain a loop having a. fixed transversedimension, and a bunch-building cam for varying the length of the loopas the ring rail rises and falls whereby a portion of the motion givento the builder chain is absorbed in the loop.

7. In a device of the class described, the combination with a ring rail,of means for giving said ring rail a traversing movement, said meansincluding a builder chain and bunch-building mechanism comprising meansfor forming in the chain a loop having a fixed transverse dimension, abunchbuilding cam for varying the length of the loop as the ring railrises and falls whereby a portion of the motion given to the builderchain is absorbed in the loop, and means to actuate said cam by movementof the chain.

8. In a. device of the class described, the combination with a ringrail, of a builder chain associated therewith for giving a rising andfalling movement thereto, and bunch-building mechanism comprising asprocket wheel engaging the chain and forming a loop therein and meansto move said sprocket wheel bodily in a direction to lengthen or shortenthe loop whereby a portion of the motion given to the builder chain isabsorbed in the loop.

9. In a device of the class described, the combination with a ring rail,of a builder chain associated therewith for giving a rising and fallingmovement thereto, and bunch-building mechanism comprising a sprocketwheel engaging the chain and forming a loop therein, a movable member onwhich said sprocket wheel. is rotatably mounted, and means to move saidmember thereby to lengthen and shorten the loop.

10. In a device of the class described, the combination with a ringrail, of a builder chain associated therewith for giving a rising andfalling movement thereto, and

bunch-building mechanism comprising a sprocket wheel engaging the chainand forming a loop therein, a swinging frame on which said sprocketwheel is rotatably mounted, and means to swing said frame thereby tolengthen or shorten the loop.

11. In a device of the class described, the combination with a ringrail, of a builder chain associated therewith for giving a rising andfalling movement thereto, and bunch-building mechanism comprising asprocket wheel engaging the chain and forming a loop therein, a movablemember on which said sprocket wheel is rotatably mounted, and meansactuated by the chain to move said member thereby to lengthen andshorten the loop.

12. In a device of the class described, the combination with a ringrail, of a builder chain associated therewith for giving a rising andfalling movement thereto, and bunch-building mechanism comprising asprocket wheel. engaging the chain and forming a loop therein, aswinging frame on which said sprocket wheel is rotatably mounted, andmeans actuated by the chain to swing said frame thereby to lengthen orshorten the loop.

13. In a device of the class described, the combination with a ringrail, of a builder chain associated therewith for giving a rising andfalling movement thereto, and bunch-building mechanism comprising asprocket wheel engaging the chain and forming a loop therein, a movablemember on which said sprocket wheel is rotatably mounted, and abunch-building cam to move said member thereby to lengthen or shortenthe loop.

114-. In a device of the class described, the combination with a ringrail, of a builder chain associated therewith for giving a rising andfalling movement thereto, and bunch building mechanism comprising asprocket wheel engaging the chain and forming a loop therein, a movablemember on which said sprocket wheel is rotatably mounted, and abunch-building cam actuated by the builder chain to move said memberthereby to lengthen and shorten the loop.

15. In a device of the class described, the combination with a ringrail, of a builder chain associated therewith for giving a rising andfalling movement thereto, and bunch-building mechanism comprising asprocket wheel engaging the chain and forming a loop therein, a swingingframe on which said sprocket wheel is rotatably mounted, and abunch-building'cam actuated by the builder chain to swing said framethereby to lengthen or shorten the loop in the builder chain.

16. In a device of the class described, the combination with a ringrail, of a builder chain operatively connected thereto, means for givingthe builder chain a reciprocating movement, and bunch-building mechanismcomprising a sprocket wheel engaging said chain and forming a looptherein, a bunchbuilding cam associated with the sprocket wheel, and anabutment against which said cam acts whereby the movement of thebunch-building cam relative to the abutment caused by the reciprocatingmovement of the builder chain operates to lengthen and shorten the loop.

17. In a device of the class described, the combination with a ringrail, of a builder chain for giving traverse to the latter, a frame, twodirection pulleys over which the builder chain passes, a swinging membercarried by the frame, a sprocket wheel rotatably mounted on saidswinging member and engaging the portion of the chain between saiddirection pulleys thereby to form a loop in the chain, and means to movesaid swinging member relative to the frame thereby to vary the length ofthe loop.

18. In a device of the class described, the

combination with a ring rail, of a builder cha n for givlng traverse tothe latter, a

frame, two direction pulleys over which the builder chain passes, aswinging member carried by the frame, a sprocket wheel rotatably mountedon said swinging member and engaging the portion of the chain betweensaid direction pulleys thereby to form a loop in the chain, and meansoperated by the movement of the chain to move said swinging memberrelative to the frame thereby to vary the length of the loop.

19. In, a device of the class described, the combination with a r1ngrail, of a builder chain for giving traverse to the latter, a frame, twodirection pulleys over which the builder chain passes, a swinging membercarried by the frame, a sprocket wheel rotatably mounted on saidswinging member and engaging the portion of the chain between saiddirection pulleys thereby to form a loop in the chain, and meansoperated by movement of the chain in one direction to move the swingingmember relative to the frame in a direction to elongate the loop,movement of the chain in the other direction operating to shorten theloop.

20. In a device of the class described, the combination with a ringrail, of a builder chain operatively connected thereto, means for givingthe builder chain a reciprocating movement, and bunch-building mechanismcomprising an oscillatory member about which the builder chain passeswhich forms a loop therein-and which is oscillated by the movementthereof, a bunch-building cam aseffect the winding of a bunch on a yarnreceiver, and means to render said cam moperative after the bunch hasbeen formed whereby the ring rail is given longer traverse to effect thelaying of a main or service winding. V V

21. In a device of the class described, the combinationwith a ring rail,of a builder chain operatively connected thereto, means for giving thebuilder chain reciprocating ,movement, and bunch-building mechanismCOIDPIISIIIg a sprocket wheel engaging sald chainand forminga loopvtherein, a swinging bunch-building cam associated with the sprocketwheel, an abutment cooperating with said cam to effect a lengthening andshortening of said loop as the chain reciprocates whereby a shorttraverse is given to the ring rail for the formation of a bunch' on ayarn receiver. Y

v 22. In a device of the class described, the combination with a ringrail, of a builder chain operatively connected thereto, means for givingthe builder chain reciprocating movement, and bunch-building mechanismcomprising a. sprocket wheel engaging said chamand formmga loop therein,a swinging bunch-building cam associated with the .sprocket wheel, anabutment cooperating with said cam to eflect a lengthening and,shortening of'said loop as, the chain reciprocates whereby a shorttraverse is given to .the ring rail for the formation of a bunch onayarn receiver, and means to move said cam progressively into a positionwhere its engagement with the abutment will render it inoperativeat'terthe bunch has been laid thereby to provide for the laying of a main orservice windin 23, In a device of the class described, the combinationwith a ring rail, of a builder chain ,operatively connected thereto,means forgiving the builder chain a reciprocating .movement, a sprocketwheel engaging said chain and forming a loop therein, a bunchbuildingcam associated with the sprocket wheel and movable from its operative toits inoperative position, an abutment against which said cam acts whenin its operative position thereby to effect a lengthening andshortening-of the loop as the builder chain reciprocates, thereby toeffect a preliminary winding on a yarn receiver w1th a short traverse,and means actuated by the reciprocation of the bu lder chain to move thewinding has been laid, whereby the ring rail will be given longertraverse for laying a service or main winding.

24. In a device of the class described, the combination with a ringrail, of a builder chain for giving traverse thereto, a frame, aswinging member carried by the frame, a. sprocket rotatably mounted onsaid swinging member and engaging said chain thereby to form a looptherein, means operated by the movement of the chain to give saidswinging member a movement which pro duces lengthening and shortening ofsaid loop whereby the ring'rail is given a short traverse to effect thelaying of a preliminary winding, and means to hold said swinging memberin stationary position during the laying of the main or service windin a25. In a device of the class described, the combination with a ringrail, of a builder chain for giving traverse thereto, a sprocket wheelaround which the chain passes and which forms a loop therein, a movablememher on which said sprocket wheel is rotatably mounted, meansassociated with the sprocket wheel for moving said movable member bodilyas the chain reciprocates,

thereby to lengthen and shorten the loop and thus produce a shorttraverse in the ring rail, to ett'ect the laying of a preliminarywinding or bunch on a yarn receiver, and means to hold said movablemember stationary during the laying of the main or service winding onsaid yarn receiver.

' 26. In a device of the class described, the combination with a ringrail, of a builder chain for giving traverse thereto, a sprocket wheelaround which the chain passes and which forms a loop therein, a movablemember on which said sprocket wheel is rotatably mounted, abunch-building cam associated with the sprocket wheel for moving saidmovable member bodily as the chain reciprocates, thereby to lengthen andshorten the loop and thus produce a short traverse in the ring rail toefi'ect the laying of a preliminary winding or bunch on a yarn receiver,means to move said cam f ro ressivel into a osition where its engagementwith the abutment will render it inoperative after the bunch has beenlaid, means to hold said movable member stationary during the laying ofthe main or service winding on said yarn receiver, and means forreturning said cam to its operative position after the main or servicewinding has been laid.

27. In a device of the class described, the combination with areciprocating ring rail, of means to reciprocate it, and means tocontrol its reciprocation to effect a preliminary winding of yarn upon ayarn receiver with a short traverse, a main or service winding on saidyarn receiver with a longer traverse and a final winding on said yarnreceiver with a short traverse.

28. In a device of the class described, the combination with areciprocating ring rail, of means to reciprocate it, and means tocontrol its reciprocation to effect three successive windings on a yarnreceiver, the first and third of which have a shorter traverse than theintermediate winding, which constitutes a main or service winding.

29. In a deviceof the class described, the combination with a ring rail,of means to reciprocate it, and means to control its reciprocation toeffect the laying of first a main or service winding on a yarn receiverand subsequently a final winding having a shorter traverse than the mainwinding.

30. In a device of the class described, the combination with a ringrail, of a builder chain operatively connected thereto, means forming aloop in said chain, means for giving the chain a to and fro movementthereby to give the ring rail its reciprocating movement to lay a mainor servlce w1nding on a yarn receiver, and means rendered operative whenthe service winding is laid to efiect a lengthening and shortening ofthe loop as the chain reciprocates whereby a final winding is laid onthe yarn receiver with a short traverse.

31. In a device of the class described, the combination with a ringrail, of a builder chain operatively connected thereto, means for givingthe builder chain to and fro movement thereby to reciprocate the ringrail to effect the formation of a main or service winding on a yarnreceiver and means rendered operative when said service winding iscompleted to absorb in the chain a part of the movement given theretoWhereby a final winding of short traverse is laid on the yarn receiver.

32. In a device of the class described, the combination with a ringrail, of a builder chain operatively connected thereto, means to givethe builder chain a to and fro move ment to produce a reciprocation ofthe ring rail and means to absorb in said builder chain a portion of themovement given thereto during the laying of both the initial and finalwinding on a yarn receiver whereby such initial and final winding willbe laid with a short traverse, said means being inoperative during thelaying of the intermediate or service winding;

38. In a device of the class described, the combination with a ringrail, of means for reciprocating said ring rail to effect the laying ofa main or service winding on a yarn receiver and means for eiiecting thelaying of a final winding on said yarn receiver with a difi'erent lengthof traverse than that of the main winding.

34. In a device of the class described, the combination with a ringrail, of means-for tion of two suceessive windings on a yarn means toreduce the length oftmerse of thering rail when'windingon the tip 6f thebobbin, thereby to produce a finalwinding with a short traverse.

36. In a device of the class describedftli'e combination with'a ringrail, of an oscillating member connected thereto, a continuous builderchain operatively connected to "said member, means-fo 'aetuatingthe'chain, and means sitnated intermediate or the ends of the chain at apointsepaiated from the escillating member but not afieeting thecentinuity of the chain aetiiatedby the movement (if Saidbhain ttj eflct thefdi receiver constituting loiinch and same windings, respectively.

37 In a device of theclassdescribed, the combination. with arin'grail,of a *biiilder chain operatively connected thereto, means for actuatingthe builder chain, and means situated intermediate of the ends of saidchain and actuated by movement thereof to efi'ect the formation of threesuccessive windings on a yarn receiver constituting preliminary service,i and final windings respectively.

38. In a builder motion, th'e'colnbi-natien with a ring-rail, of builderine'chanism'fofr giving traverse to the ring-rail and including abuilder chain, and means to actuate the latter, buneh-buildingmechanism66inprising means operative in all positiens "er the ring-rail 'to terma 1616p in the'chain,

and means for c'ansing a lengthenin" and shorten the loop thereby toproduce a short traversein the ring rail for the formation or a bunch. I

40. In a device'of'the class described, the combination with a' ringrail, of a rocking member connected thereto, a builder-arm,

ilo

means for actuating -the-1atter,-a contiriuoiis in chain connecting thebuilder arm to the rocking member,. and means situated between saidrocking member and said arm and cooperating with the chain to absorb apart of the movement given to said chain by the builder arm during thelaying of the initial Winding on a yarn receiver.

In testimony whereof, I have signed my name to this specification, inthe presence of tWo subscribing Witnesses.

LOUIS S. BURBANK.

Witnesses DANA OscooD, FRED R. DANIELS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. C."

It is hereby certified that in Letters Patent No. 1,125,924, grantedJanuary 26, 1915, upon the application of Louis S. Burbank, of Hopedale,Massachusetts, for

an improvement in Traverse-Motions for Yarn-Spinning Apparatus, an errorappears in the printed specification requiring correction as follows:Page 10, line 102, after the Word preliminary insert a comma; and thatthe said Letters Patent should be read with this correction therein thatthe same may conform to the record of the casein the Patent Ofiice.

Signed and sealed this 9th day of February, A. D., 1915.

[SEAL] J. T. NEWTON,

Acting Commissioner of Patents.

